Contrast media
Gadolinium-based contrast media is given to enhance is useful in brain imaging. It is often believed that the contrast media (gadolinium) is indicated for all the lesions.
IV- Gadolinium: 0.1-0.2 mmol/kg of body weight
-is given as a bolus at the rate of 1ml/sec.
-like a slow infusion at a rate of 1ml/sec.
Prepare the head coil.
Patient position:
The patient lies in the supine position with the head first.
Topogram positioning / Landmark- Center the FOV on the glabella in the midline.
MRI Brain Protocols
Routine brain Protocol
Sequence-
– Scout: 3 plane localizers
– T2 FSE in the axial plane
– T2 FLAIR in the axial plane
– T1 SE in the sagittal plane & coronal plane
– DW EPI based in the axial plane
– Post-contrast – T1 SE in the axial plane and coronal plane
Axial sequence
- The plot on the sagittal plane
- Parallel to the line joining the genu and splenium of the corpus callosum
- FOV- 220-240mm
- Slice thickness- 5-6mm
- Saturation slab- parallel to the slices, inferior to the most caudal slice and thickness of approx. 50-80mm
- Matrix- 512 x 512
T1 weighed
- Repetition time, TR- 364ms
- Echo time, TE- 15ms
T2 weighed
- Repetition time, TR- 4500ms
- Echo time, TE- 100ms